Since the lens (10) includes the alignment portions (14), the lens (10) is positioned with high precision with respect to the second mold (61) during molding of the holder member (40), and the holder member (40) and the lens (10) are positioned with each other with high precision. Further, since the positioning of the lens (10) with respect to the second mold (61) may be performed using the alignment portions (14) provided outside the second optical surface (13e), influence of the heat and pressure produced by the second mold (61) and the resin during molding of the holder member (40) on the second optical surface (13e) of the lens (10) may be reduced. Therefore, occurrence of degradation, such as distortion, in the second optical surface (13e) of the lens (10) during molding of the holder member (40) may be prevented.
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1. An image pickup lens unit, comprising: a lens which includes a first optical surface and a second optical surface formed on the opposite side of the first optical surface; and a holder member integrally molded to hold the lens therein with the first and second optical surfaces being exposed,
wherein the lens includes an alignment portion for positioning the lens with respect to a mold when the lens is placed in the mold which has a molding space for molding the holder member; and
wherein the alignment portion is provided outside of any one of the first and second optical surfaces and at least a part of the inside of the alignment portion is exposed from the holder member.
13. A method for manufacturing an image pickup lens unit, comprising: a lens which includes a first optical surface and a second optical surface formed on the opposite side of the first optical surface; and a holder member integrally molded to hold the lens therein with the first and second optical surfaces being exposed,
wherein a forming mold for molding the holder member includes a first mold and a second mold;
wherein the lens includes an alignment portion provided outside of any one of the first and second optical surfaces and positions the lens with respect to the first or the second mold;
wherein any one of the first and second molds has a positioning portion which faces the alignment portion and positions the lens; and
wherein the method includes:
a process of inserting the lens in the first or second mold so that at least a part of the positioning portion is in contact with an inner surface of the alignment portion of the lens,
a process of performing mold clamp in a state in which the lens is positioned with respect to the first or second mold,
a process of flowing resin in a state in which the lens is kept inside of the first and the second molds to mold the holder member, and
a process of relatively opening the first and the second molds and taking the image pickup lens unit out.
2. The image pickup lens unit according to
3. The image pickup lens unit according to
4. The image pickup lens unit according to
5. The image pickup lens unit according to
6. The image pickup lens unit according to
7. The image pickup lens unit according to
8. The image pickup lens unit according to
10. The image pickup lens unit according to
11. The image pickup lens unit according to
12. The image pickup lens unit according to
14. The method for manufacturing an image pickup lens unit according to
15. The method for manufacturing an image pickup lens unit according to
16. The method for manufacturing an image pickup lens unit according to
17. The method for manufacturing an image pickup lens unit according to
18. The method for manufacturing an image pickup lens unit according to
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This is a U.S. National stage of International application No. PCT/JP2012/074878 filed on Sep. 27, 2012.
This patent application claims the priority of Japanese application no. 2011-217806 filed Sep. 30, 2011, the disclosure content of which is hereby incorporated by reference.
The present invention relates to an image pickup lens unit in which a lens is assembled into a holder, and to a method for manufacturing an image pickup lens unit.
An image pickup lens unit assembled into, for example, a mobile phone has a structure to retain a periphery of an optical lens for imaging by a holder. Significantly high positioning accuracy needs to be ensured in assembling the optical lens into the holder and, therefore, such an assembling is typically performed by using an automatic assembling system which has adopted an image recognition technique. Such a system, however, is very expensive and requires a very large area to configure a manufacturing line in which an insertion process for inserting the lens in the holder, a bonding process for bonding the lens to the holder, and the like are provided separately. Therefore, replacement of the equipment performed each time when the kind or type of lens is changed becomes large in scale and requires increased numbers of work steps.
As a manufacturing method for solving such problems, a technique to collectively assembling an image pickup lens unit by, after placing and positioning a lens and a diaphragm within a mold in advance with reference to an outer edge of the lens, forming a holder by injection molding on the periphery of the lens and the like is known (see Patent Literature 1).
In the manufacturing method of Patent Literature 1, however, in a case in which a lens diced from a wafer level lens is used, the following problem occurs: since a degree of eccentricity of an outer edge of the lens and an optical surface depends on the dicing precision of the wafer level lens, if misalignment (or eccentricity) is caused between the outer edge of the lens and the optical surface, it is difficult to obtain satisfactory optical performance.
Japanese Unexamined Patent Application Publication No. 2009-300626
An object of the present invention is to provide an image pickup lens unit in which a holder member and a lens are positioned with each other with high precision regardless of an outer edge shape of the lens.
Another object of the present invention is to provide a method for manufacturing an image pickup lens unit capable of molding a holder member while a lens is being positioned with respect to a mold regardless of an outer edge shape of the lens.
In order to achieve the above-described objects, an image pickup lens unit according to the present invention is an image pickup lens unit, including: a lens which includes a first optical surface and a second optical surface formed on the opposite side of the first optical surface; and a holder member integrally molded to hold the lens therein with the first and second optical surfaces being exposed, wherein the lens includes an alignment portion for positioning the lens with respect to a mold when the lens is placed in the mold which has a molding space for molding the holder member; and wherein the alignment portion is provided outside of any one of the first and second optical surfaces and at least a part of the inside of the alignment portion is exposed from the holder member. Here, the reason that at least a part of the inside of the alignment portion is exposed from the holder member is that the holder member is molded in a state in which the lens is aligned by each positioning portion (which may be a positioning portion that functions also as a support portion) provided in the mold being in contact with at least a part of the inside of the alignment portion. If a clearance, i.e., a gap, between the lens and the positioning portion of the mold is substantially zero, all the positioning locations are exposed. If the clearance is large and there is rattling between the lens and the mold, only the part at which the lens and the mold come in contact with each other is exposed. Thus, positioning accuracy between the lens and the holder member may be checked in a simple manner using the exposed location. It is obvious that the location of the positioning portion and the size of a contact portion should be considered so that defects, such as ghost, are not caused by reflection at this exposed portion. The inside of the alignment portion refers to an area of the alignment portion on the side of the optical surface when a line which passes the center of the alignment portion and is vertical to a line which connects the center of the optical surface and the center of the alignment portion is drawn (see
According to the image pickup lens unit described above, since the lens includes the alignment portion, the lens is positioned with high precision with respect to the mold during molding of the holder member, and the holder member and the lens are positioned with each other with high precision. Further, since the positioning of the lens with respect to the mold may be performed using the alignment portion provided outside the optical surface, influences of the heat and pressure produced by the mold or resin during molding of the holder member on the optical surface may be reduced. Therefore, occurrence of degradation, such as distortion, in the optical surface of the lens during molding of the holder member may be prevented. Since the lens is positioned with respect to the mold by the inside of the alignment portion, the size of an opening of the image pickup lens unit may be reduced as compared with a case in which the lens is positioned outside the alignment portion.
In a specific aspect of the present invention, in the image pickup lens unit, the alignment portion is formed integrally with a part outside of any one of the first and second optical surfaces of the lens. In this case, the alignment portion may be easily molded together with the lens.
In another aspect of the present invention, the alignment portion includes at least one of protrusion and recession in shape with respect to a surface other than the first or second optical surface of the lens. In this case, alignment in the direction vertical to the lens optical axis may be performed easily by the protrusion or recession in shape.
In yet another aspect of the present invention, the alignment portion includes a stepped portion with respect to a flat surface of an outer peripheral portion extending from an outer edge of the first or second optical surface. In this case, alignment in the direction vertical to the lens optical axis may be performed reliably by the stepped portion between the flat surface of the outer peripheral portion extending from the outer edge of the first or second optical surface and the alignment portion.
In yet another aspect of the present invention, at least two alignment portions are provided in the surroundings of at least one of the first and second optical surfaces and the alignment portions are arranged separately. In this case, the alignment portions may be formed only at a necessary location. For example, if the alignment portion is a protrusion in shape, the material of the alignment portion may be reduced.
In yet another aspect of the present invention, the shape of the alignment portion is any one of a round column shape, a quadrangular prism shape and a shape having a slope with respect to a lens optical axis. Here, in the shape which has a slope with respect to the lens optical axis, the slope includes not only a flat surface but also a curved surface.
In yet another aspect of the present invention, at least one alignment portion is provided in the surroundings of at least one of the first and second optical surfaces and is formed in a shape to surround the optical surface. In this case, since a contact area between the alignment portion and the mold becomes large, the lens may be stably positioned with respect to the mold.
In yet another aspect of the present invention, the shape of the alignment portion is any one of a shape which has a surface parallel to a lens optical axis and a shape which has a slope with respect to the lens optical axis.
In yet another aspect of the present invention, the alignment portion is defined higher than the optical surface, whereby damage to the optical surface may be prevented.
In yet another aspect of the present invention, lens is made of resin. In this case, the alignment portion may be formed easily together with the molding of the lens body.
In yet another aspect of the present invention, the lens includes a glass substrate and a resin portion formed on at least one of surfaces of the glass substrate, and wherein the alignment portion is formed in the resin portion. In this case, the alignment portion may be formed together with the molding of the resin portion.
In yet another aspect of the present invention, the lens includes a diaphragm at least on the surface of the lens or inside the lens. In this case, entering of light into an outer peripheral portion of the lens including the alignment portion and the like may be prevented. Therefore, production of stray light caused by incident light to into the outer peripheral portion of the lens may be prevented.
In yet another aspect of the present invention, the lens is formed by dicing a wafer lens into a single piece. In this case, even if misalignment has occurred between an outer edge shape of the lens which has been divided into a single piece and the first and second optical surfaces, the lens may be positioned with high precision with respect to the holder member.
In order to achieve the above-described object, a method for manufacturing an image pickup lens unit according to the present invention is a method for manufacturing an image pickup lens unit, including: a lens which includes a first optical surface and a second optical surface formed on the opposite side of the first optical surface; and a holder member integrally molded to hold the lens therein with the first and second optical surfaces being exposed, wherein a forming mold for molding the holder member includes a first mold and a second mold; wherein the lens includes an alignment portion provided outside of any one of the first and second optical surfaces and positions the lens with respect to the first or the second mold; wherein any one of the first and second molds has a positioning portion which faces the alignment portion and positions the lens; and wherein the method includes a process of inserting the lens in the first or second mold so that at least a part of the positioning portion is in contact with an inner surface of the alignment portion of the lens, a process of performing mold clamp in a state in which the lens is positioned with respect to the first or second mold, a process of flowing resin in a state in which the lens is kept inside of the first and the second molds to mold the holder member, and a process of relatively opening the first and the second molds and taking the image pickup lens unit out.
According to the manufacturing method described above, since the lens includes the alignment portion, the lens may be positioned with high precision with respect to the mold during molding of the holder member. Further, since the positioning of the lens with respect to the mold may be performed using the alignment portion provided outside the optical surface, heat and pressure produced during molding of the holder member are reduced by the positioning portion. Therefore, occurrence of degradation, such as distortion, in the optical surface of the lens during molding of the holder member may be prevented. Since the lens is positioned with respect to the mold by the inside of the alignment portion, the size of an opening of the image pickup lens unit may be reduced as compared with a case in which the lens is positioned outside the alignment portion.
In a specific aspect of the present invention, in the method for manufacturing an image pickup lens unit, at least two alignment portions are provided in the surroundings of at least one of the first and second optical surfaces and the alignment portions are arranged separately.
In another aspect of the present invention, the positioning portion includes a support surface which protrudes or extends further than an inscribed circle of the positioning portion in the surroundings of the first or second optical surface and prevents rotation of the alignment portion around a lens optical axis. In this case, not only decentering and movement in a height direction (the direction parallel to the lens optical axis) of the lens but also the rotation of lens may also be restricted.
In yet another aspect of the present invention, at least one alignment portion is provided in the surroundings of at least one of the first and second optical surfaces and is formed in a shape to surround the optical surface.
In yet another aspect of the present invention, the positioning portion of the lens includes a mechanism for sucking the lens. In this case, the lens may be positioned stably.
Hereinafter, a method for manufacturing an image pickup lens unit according to a first embodiment of the present invention and an image pickup lens unit obtained by this method will be described with reference to the drawings.
As illustrated in
The lens 10 is, for example, formed by dicing a lens wafer or a wafer lens (a wafer shaped base material) in which a plurality of lenses are arranged in two dimensions, into a single piece. As illustrated in
The glass substrate 11 is an optically transparent plate. The glass substrate 11 is not necessarily made of glass and may be replaced by a substrate made of, for example, a resin material. The glass substrate 11 may have a function as, for example, an IR cut filter.
The first lens layer 12 includes a circular lens body portion 12a disposed at the central portion near a lens optical axis OA and a rectangular or square frame portion 12b extending around the lens body portion 12a. The lens body portion 12a is, for example, an aspherical lens portion and has a first optical surface 12d on the side of a front or external surface to be exposed. The optical surface herein means a portion having an optical function, i.e., a surface having an effective diameter. The frame portion 12b is a flat layer which has a first frame surface 10d on the side of the front surface. The first frame surface 10d is a flat surface which extends vertically to the lens optical axis OA. The first optical surface 12d which is inside and the first frame surface 10d which is outside form a first surface of the lens 10. The first lens layer 12 is made of, for example, curable resin with reflow heat resistance. Examples of the curable resin include thermosetting resin, photocuring resin and radiation curable resin.
Similarly, the second lens layer 13 includes a circular lens body portion 13a disposed at the central portion near the lens optical axis OA and a rectangular or square frame portion 13b extending around the lens body portion 13a. The lens body portion 13a is, for example, an aspherical lens portion and has a second optical surface 13e on the side of the front or external surface to be exposed. The frame portion 13b is a flat layer which has a second frame surface 10e on the side of the front surface. The second frame surface 10e is a flat surface which extends vertically to the lens optical axis OA. The second optical surface 13e which is inside and the second frame surface 10e which is outside form a second surface of the lens 10. Like the first lens layer 12, the second lens layer 13 is made of, for example, curable resin with reflow heat resistance.
In the lens 10 described above, the upper lens body portion 12a, the lower lens body portion 13a and the central portion of the glass substrate 11 disposed between these lens body portions constitute a central optical portion 10a which functions as a lens. Further, in the lens 10, the upper frame portion 12b, the lower frame portion 13b and a peripheral portion of the glass substrate 11 disposed between these frame portions constitute a flange portion 10b (an outer peripheral portion) which extends in the surroundings or vicinity of the central optical portion 10a and is circular at the inside thereof and is rectangular at the outside thereof.
The first lens layer 12 and the second lens layer 13 may be made of thermoplastic resin instead of curable resin. In that case, however, it is desirable that the first lens layer 12 and the second lens layer 13 are thermally stable during molding of the holder member 40 which will be described later and have heat characteristics not to be easily softened with heat during molding of the holder member 40.
The lens 10 includes alignment portions 14 on the frame portion 13b of the second lens layer 13. The alignment portions 14 are integrated with the frame portion 13b. Specifically, the alignment portions 14 are disposed outside the second optical surface 13e, i.e., outside the effective diameter, at four places on the diagonal lines of the lens 10, and at four places along the circumference at regular intervals. That is, the alignment portion 14 is constituted by divided plural alignment portions 14. Each alignment portion 14 is, for example, a round column-shaped projection vertically disposed on the surface outside the second optical surface 13e (the second frame surface 10e). That is, the alignment portion 14 has a stepped portion projecting outside the second optical surface 13e with respect to the second frame surface 10e of the frame portion 13b which is the outer surrounding portion extending from the outer edge of the second optical surface 13e. With this configuration, alignment in the direction vertical to the lens optical axis OA may be performed easily and reliably by using a set of a plurality of alignment portions 14. These alignment portions 14 are formed integrally outside the second optical surface 13e and made of the same resin material as that of the second lens layer 13.
As illustrated in
With reference to
The holder member 40 retains the flange portion 10b of the lens 10 from the periphery to surround the same. That is, the upper portion 41 of the holder member 40 faces an upper first frame surface 10d of the lens 10 and restricts upward movement of the lens 10 along the lens optical axis OA. The side wall portion 43 faces four side surfaces 10f of the lens 10 and restricts lateral movement of the lens 10 vertical to the lens optical axis OA. At the same time, the side wall portion 43 faces the lower second frame surface 10e of the lens 10 and restricts downward movement of the lens 10 along the lens optical axis OA. In this manner, since the holder member 40 which is a single member contacts closely to the periphery of the flange portion 10b of the lens 10, the movement of the lens 10 with respect to the holder member 40 may be prevented reliably. Since the holder member 40 is in close contact with the lens surface without any gap, ghost generated by the light entering through the gap may be reduced.
Regarding the upper portion 41, the lower inner surface 41g contacts closely to a peripheral side area of the first frame surface 10d of the lens 10. A circular opening OP1 is formed at the center of the upper portion 41, and an annular edge portion 40i surrounding the opening OP1 is arranged to shield the vicinity or surroundings of the first optical surface 12d of the lens 10 so as to function as a kind of diaphragm.
The side wall portion 43 includes a rectangular tubular shaped wall body portion 43a and a rectangular fixing portion 43b provided inside the wall body portion 43a. The former wall body portion 43a is connected integrally with the upper portion 41 at an upper end thereof. An inner surface 43f of an upper portion of the wall body portion 43a contacts closely to the side surface 10f of the lens 10. The latter fixing portion 43b is provided to extend inward from the central portion in the up-down direction of the wall body portion 43a along the lens optical axis OA and is formed as a plate which is circular at the inside thereof and is rectangular at the outside thereof. Regarding the fixing portion 43b, the upper inner surface 43g contacts closely to the peripheral side area of the second frame surface 10e of the lens 10. An annular edge portion 40j formed at the center of the fixing portion 43b and surrounding an opening OP2 is arranged to shield the vicinity or surroundings of the optical surface 13e of the lens 10 so as to function as a kind of diaphragm.
Regarding the upper first surface of the lens 10, surface portions except for the finally exposed first and second optical surfaces 12d and 13e, and except for an area near the first and second optical surfaces 12d and 13e with which first and second molds 51 and 61 are in contact during molding of the holder member 40 are brought into contact with fluid resin before curing during injection molding of the holder member 40. Therefore, when resin cures, for example, the inner surface 41g of the upper portion 41 of the holder member 40 adheres to the first frame surface 10d of the lens 10 and the inner surface 43g of the fixing portion 43b adheres to the second frame surface 10e of the lens 10. Especially, the surface of the lens 10 is made of resin and, for example, the first frame surface 10d of the lens 10 and the inner surface 41g of the upper portion 41 of the holder member 40 are welded and bonded strongly to each other with the surface of the first frame surface 10d of the lens 10 being softened with heat during injection molding of the holder member 40. That is, the first frame surface 10d and the inner surface 41g are joined directly without using an adhesive. Similarly, the side surface 10f of the lens 10 and the inner surface 43f of the side wall portion 43 of the holder member 40 are joined directly without using an adhesive, and the second frame surface 10e of the lens 10 and the inner surface 43g of the fixing portion 43b of the holder member 40 are joined directly without using an adhesive. Regarding the fixing portion 43b of the holder member 40, the side surface 14b except a part of the side surface 14b of the alignment portions 14 of the lens 10 illustrated in
In the thus-configured image pickup lens unit 100, since the holder member 40 contacts closely to the periphery of the lens 10 without any gap, ghost and flare caused by the light entering from the side surface 10f of the lens 10 may be prevented. Since there is no unnecessary gap in the side surface 10f and the like of the lens 10, the size of the image pickup lens unit 100 may be reduced and thus it becomes easy to satisfy exterior specification required when the image pickup lens unit 100 is supposed to be mounted on a final product, such as an image pickup device. Deterioration in dimensional accuracy due to deformation during mold release or due to contraction of the holder member in a prior art holder may also be reduced.
Although the lens 10 is a compound lens in the above description, the entire lens 10 may be made of a single resin material. In a case in which the lens 10 is a compound lens, the resin-made lens layers 12 and 13 may be arranged at the central side and the glass substrate 11 may be exposed at the outermost edge of the lens 10.
Hereinafter, with reference to a manufacturing procedure illustrated in
First, as illustrated in
The first mold (the fixed mold) 51 includes a first molding portion 59 provided substantially along a parting surface 51a. The first molding portion 59 is formed at an end portion 54 of a mold portion 53 fixed in an embedded manner to a hole 52c of a mold plate 52 of the first mold 51 and at the mold plate 52. The end portion 54 of the mold portion 53 is a support portion for the lens 10 and includes a resin block portion 55 on the outer periphery side thereof. The second mold (the movable mold) 61 includes a second molding portion 69 which faces the first molding portion 59 and is recessed from a parting surface 61a. The second molding portion 69 is formed at an end portion 64 of a mold portion 63 fixed in an embedded manner to a hole 62c of a mold plate 62 of the second mold 61 and at the mold plate 62. The end portion 64 of the mold portion 63 is a support portion for the lens 10 and includes a positioning portion 65 on the outer periphery side thereof. The positioning portion 65 positions the lens 10 with respect to the second mold 61 by being in contact with the inside of the alignment portion 14 of the lens 10 and, in particular, in contact with the inner exposed portion 14a of the side surface 14b. Here, inside of the alignment portion 14 refers to, as illustrated in
Unillustrated groove-shaped resin injection paths are provided at the molds 51 and 61 on the side of the parting surfaces 51a and 61a. In addition, although a heating mechanism for heating the first and the second molds 51 and 61, a platen for pressing the first and the second molds 51 and 61 from behind and the like are also provided, illustration thereof are omitted to make understanding easy.
Then, a transport device 70 holding the lens 10 is moved to an upper position of the second molding portion 69 or the mold portion 63 provided in the second mold 61 (step S12 of
Further, as illustrated, the arm 71 of the transport device 70 is made to approach until the lens 10 approaches the second molding portion 69. The lens 10 held by the arm 71 is fitted so that the inside of the alignment portion 14 of the lens 10 and the outside of the positioning portion 65 provided in the end portion (the support portion) 64 of the mold portion 63 of the second mold 61 are in contact with each other. Specifically, as illustrated in
Next, as illustrated in
Here, on the side of the first molding portion 59 provided in the first mold 51, an annular resin block portion 55 is formed at the end portion (the support portion) 54 of the mold portion 53. The resin block portion 55 contacts closely to the innermost circumference portion of the flange portion 10b of the lens 10 so as to prevent flow resin MP from entering a space S1 adjoining the optical surface 12d in a molding process which will be described later (see
On the side of the second molding portion 69 provided in the second mold 61, an annular positioning portion 65 is formed at the end portion (the support portion) 64 of the mold portion 63 (see
Next, as illustrated in
Next, as illustrated in
According to the image pickup lens unit 100 of the first embodiment, since the lens 10 includes the alignment portions 14, the lens 10 is positioned with high precision with respect to the second mold 61 during molding of the holder member 40, and the holder member 40 and the lens 10 are positioned with each other with high precision. Further, since the positioning of the lens 10 with respect to the second mold 61 may be performed using the alignment portions 14 provided outside the second optical surface 13e, influence of the heat and pressure produced by the second mold 61 and the resin during molding of the holder member 40 on the second optical surface 13e of the lens 10 may be reduced. Therefore, occurrence of degradation, such as distortion, in the second optical surface 13e of the lens 10 during molding of the holder member 40 may be prevented. Since the lens 10 is positioned with respect to the second mold 61 inside the alignment portions 14, the size of the opening OP2 of the image pickup lens unit 100 may be reduced as compared with a case in which the lens 10 is positioned outside the alignment portions 14.
Instead of providing the positioning portion 14 as in the present embodiment, a bending portion may be provided on an outer edge of the second optical surface 13e and positioning is performed by using the second mold 61 at the bending portion. In the case of this method, however, since the second optical surface 13e of the lens 10 and the bending portion continue each other, there is a possibility that distortion may occur on the optical surface when the lens 10 is pressed by the mold during molding of the holder member 40.
Hereinafter, a method for manufacturing an image pickup lens unit and the like according to a second embodiment will be described. The method for manufacturing the image pickup lens unit and the like according to the second embodiment is a variation of the method for manufacturing the image pickup lens unit 100 and the like of the first embodiment and, therefore, portions not especially described should be the same as those of the first embodiment.
As illustrated in
Hereinafter, a method for manufacturing an image pickup lens unit and the like according to a third embodiment will be described. The method for manufacturing the image pickup lens unit and the like according to the third embodiment is a variation of the method for manufacturing the image pickup lens unit 100 and the like of the first embodiment and, therefore, portions not especially described should be the same as those of the first embodiment.
As illustrated in
Hereinafter, a method for manufacturing an image pickup lens unit and the like according to a fourth embodiment will be described. The method for manufacturing the image pickup lens unit and the like according to the fourth embodiment is a variation of the method for manufacturing the image pickup lens unit 100 and the like of the first embodiment and, therefore, portions not especially described should be the same as those of the first embodiment.
As illustrated in
Hereinafter, a method for manufacturing an image pickup lens unit and the like according to a fifth embodiment will be described. The method for manufacturing the image pickup lens unit and the like according to the fifth embodiment is a variation of the method for manufacturing the image pickup lens unit 100 and the like of the fourth embodiment and, therefore, portions not especially described should be the same as those of the fourth embodiment.
As illustrated in
Hereinafter, a method for manufacturing an image pickup lens unit and the like according to a sixth embodiment will be described. The method for manufacturing the image pickup lens unit and the like according to the sixth embodiment is a variation of the method for manufacturing the image pickup lens unit 100 and the like of the first embodiment and, therefore, portions not especially described should be the same as those of the first embodiment and other embodiments.
As illustrated in
Hereinafter, a method for manufacturing an image pickup lens unit and the like according to a seventh embodiment will be described. The method for manufacturing the image pickup lens unit and the like according to the seventh embodiment is a variation of the method for manufacturing the image pickup lens unit 100 and the like of the first embodiment and, therefore, portions not especially described should be the same as those of the first embodiment.
As illustrated in
Hereinafter, a method for manufacturing an image pickup lens unit and the like according to an eighth embodiment will be described. The method for manufacturing the image pickup lens unit and the like according to the eighth embodiment is a variation of the method for manufacturing the image pickup lens unit 100 and the like of the first embodiment and, therefore, portions not especially described should be the same as those of the first embodiment.
As illustrated in
Although the present invention has been described with reference to the embodiments, the present invention is not limited to these embodiments. For example, in the embodiments described above, the lens 10 may be a single lens made of glass or resin.
In each of the embodiments described above, the shape and the structure of the lens 10 are illustrative only and may be changed suitably. For example, the lens 10 is not necessarily rectangular when viewed in a plan view but may be circular when viewed in a plan view.
In the first embodiment, although the mold device 90 is a lateral device which moves the second mold 61 in the left-right direction, the mold device 90 may be a vertical device which moves the second mold 61 in the up-down direction. In this case, it is not necessary to provide a suction mechanism like the air outlet hole 81.
In the embodiments described above, although thermoplastic resin is used as the resin material which constitutes the holder member 40, the material of the holder member 40 is not limited to the same; curable resin, such as thermosetting resin and photocuring resin, may also be used.
In the embodiments described above, plural molding portions may be provided in the mold so that holders may be molded for plural lenses at the same time. In this case, it is not necessary to arrange a member for alignment of the two molds in each molding portion and, for example, it is only necessary to use common alignment members for plural molding portions by, for example, providing taper pins and fitting holes in which the taper pins are to be fitted in each mold at two places in the entire mold.
In the fourth and the fifth embodiments, the alignment portions 314 and 414 of the lens 10 have the shape with the slope with respect to the lens optical axis OA; however, as illustrated in
In the seventh embodiment, the number of the alignment portions 14 of the lens 10 is not necessarily four but may be two as illustrated in
In the embodiments described above, the holder member 40 is not formed in the exposed portions 14a at which the alignment portions 14 are in contact with the positioning portion 65 and is thus exposed; however, if the holder member 40 is molded in a state in which a slight gap exists between the alignment portions 14 and the positioning portion 65, a thin resin layer may be formed on the exposed portions 14a. This is because, although alignment is basically performed without any gap in many cases, in some cases, such as plural alignment portions 14 are provided, a partial deviation may be caused and a gap may be produced due to machining accuracy of the second mold 61. In this case, however, the gap is very slight and other portions are molded without any gap; therefore, no large problem may be caused.
In the embodiments described above, the positioning portion 65 may be provided in the first mold 51 on the fixed side instead of the second mold 61 on the movable side.
Mori, Hajime, Akutsu, Dai, Wada, Kazuhiro
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